Spider chastity belt
Some Germans recently did some research on spider copulation, as you do.
“Ve haff some goot news, unt some bad news”.
The bad news is that during sex 80% of the male spiders had their penis break off inside the female.
The good news is that the bit left behind acts as a plug, decreasing competion from subsequent suitors. It also means that the male spider got away in time before the female ate him!